Improvement in belaying-pins



J. W. NORCROSS.

BELAYNGPIN.

No.179.129. Patented June 27,1876.

wl-rNssEs.

PATENT JOSEPH W. NORCROSS, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN BELAVING-PINS.

Specication forming part of Letters Patent No. l 79. 129, dated June 27,1876; application filed `March 18, 1876.

To all ywhom t may concern:

Be it known that I, JOSEPH W. NORCROSS, of the city of Boston, county ofSuffolk and State of Massachusetts, have invented certain new and usefulImprovements in Bel-aying or Thole Pins; and I hereby declare4 that thefollowing is a full, clear, and exact description ofthe same, referencebeing had to the accompanying drawings forming part of this specication.

Figure l is a View of my improved belaying or thole pin, which, inappearance, does not differ from the ordinary belaying-pins. Fig. 2 is asection of the same, showing the uniform distribution of metal in thesame, the shape of the core, and the plugs by which the holes in theends are closed.

This invention has reference to the manner of casting and constructingbelaying-pins of metal, so that a less quantity of metal will produce astronger, lighter, and better pin, than pins as heretofore constructed.

In the drawings, a represents the pin proper; B, the handle; c, theshoulder formed at the junction of the pin and handle. d and E areplugs, by which the holes in the ends of the pin, through which the coreis extended in casting, are closed.

Belaying or thole pins have .heretofore been made either solid or castwith a hole of uniform or nearly uniform diameter from end to end. VSuchpins are too heavy for ordinary use, and when cast with a straight holethrough their center they are still tooV heavy, and on account of theunequal distribution of the metal, they shrink unequally, causing astrain on the metal at the junction of the pin with the handle, wherethe shoulder c, having a large quantity of metal in close proximity tothe pin a, having a small quantity of metal .cool unequal, and thisstrain causes the pin to break Voff the handle when used for theordinary purposes intended.

My improved belaying or thole pin, to avoid these difficulties, is caston a core conforming to the configuration of the 'outside of the pin, soas to secure a uniform or nearly uniform thickness of metal, which willcool and contract uniformly and leave the whole without any straincaused by unequal contraction ofthe metal, thus producing abelaying-pin, which islghter, cheaper, and stronger than has beenheretofore possible. The core itself' is stronger than the long, thin,straight core heretofore used, and is less liable to settle, thuspreventing loss in casting.

Themetal in my improved belaying or thole pin, being of uniformthickness, can be thoroughly annealed, and, when made of malleable iron,will be as strong as a solid pin and much lighter, therefore moreconvenient and desirable.

Belaying-pins, when cast with a central hole .of uniform diameter, haveheretofore been made with open ends. The edges of these holes are liableto injure the hands in using the belaying-pin. In my belaying-pin theseholes are closed by plugs, and finished smooth and even. These plugs maybe secured by heating the pin, driving in the plugs cold, so the pin canshrink and hold the same, or they may be secured in any other suitablemanner, so that when the pin is finished it shall have the appearance ofa solid belaying-pin.

Having thus described my invention, I claim as new anddesire to secureby Letters Patent- 1. As a new article of manufacture, the hollowbelaying or thole pin, substantially as described, having such shape asto produce a pin of uniform, or nearly uniform, thickness of metalthroughout, as and for the purpose set forth.

2. The hollow cast-metal belaying-pin, provided with the plugs d and E,substantially as and for the purpose specified.

JOSEPH W. NORCROSS.

Witnesses:

JOSEPH A. MILLER, HORACE F. HoR'roN.`

